FR2424601A1 - PROCESS FOR SERVICING THE READING SIGNAL OF AN INFORMATION MEDIA AND DEVICE FOR IMPLEMENTING IT - Google Patents

PROCESS FOR SERVICING THE READING SIGNAL OF AN INFORMATION MEDIA AND DEVICE FOR IMPLEMENTING IT

Info

Publication number
FR2424601A1
FR2424601A1 FR7812118A FR7812118A FR2424601A1 FR 2424601 A1 FR2424601 A1 FR 2424601A1 FR 7812118 A FR7812118 A FR 7812118A FR 7812118 A FR7812118 A FR 7812118A FR 2424601 A1 FR2424601 A1 FR 2424601A1
Authority
FR
France
Prior art keywords
servicing
zone
maximum amplitude
information media
implementing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
FR7812118A
Other languages
French (fr)
Other versions
FR2424601B1 (en
Inventor
Claude Cardot
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
CII HONEYWELL BULL
Original Assignee
CII HONEYWELL BULL
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by CII HONEYWELL BULL filed Critical CII HONEYWELL BULL
Priority to FR7812118A priority Critical patent/FR2424601A1/en
Priority to GB7911976A priority patent/GB2022886B/en
Priority to JP4918979A priority patent/JPS54143611A/en
Priority to IT22080/79A priority patent/IT1112524B/en
Priority to DE19792916473 priority patent/DE2916473A1/en
Publication of FR2424601A1 publication Critical patent/FR2424601A1/en
Application granted granted Critical
Publication of FR2424601B1 publication Critical patent/FR2424601B1/fr
Granted legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B27/00—Editing; Indexing; Addressing; Timing or synchronising; Monitoring; Measuring tape travel
    • G11B27/10—Indexing; Addressing; Timing or synchronising; Measuring tape travel
    • G11B27/102—Programmed access in sequence to addressed parts of tracks of operating record carriers
    • G11B27/105—Programmed access in sequence to addressed parts of tracks of operating record carriers of operating discs
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/10—Digital recording or reproducing
    • G11B20/10009—Improvement or modification of read or write signals
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B27/00—Editing; Indexing; Addressing; Timing or synchronising; Monitoring; Measuring tape travel
    • G11B27/10—Indexing; Addressing; Timing or synchronising; Measuring tape travel
    • G11B27/19—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier
    • G11B27/28—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier by using information signals recorded by the same method as the main recording
    • G11B27/30—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier by using information signals recorded by the same method as the main recording on the same track as the main recording
    • G11B27/3027—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier by using information signals recorded by the same method as the main recording on the same track as the main recording used signal is digitally coded
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/02—Recording, reproducing, or erasing methods; Read, write or erase circuits therefor
    • G11B5/027—Analogue recording
    • G11B5/035—Equalising
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B2220/00—Record carriers by type
    • G11B2220/20—Disc-shaped record carriers

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Digital Magnetic Recording (AREA)
  • Indexing, Searching, Synchronizing, And The Amount Of Synchronization Travel Of Record Carriers (AREA)
  • Signal Processing For Digital Recording And Reproducing (AREA)
  • Manipulation Of Pulses (AREA)

Abstract

PROCEDE D'ASSERVISSEMENT DU SIGNAL DE LECTURE D'UN SUPPORT D'INFORMATIONS PORTEES PAR UNE PLURALITE DE PISTES DONT LES INFORMATIONS DE REPERAGE SONT INSCRITES A L'INTERIEUR D'UNE PLURALITE DE ZONES DE REFERENCE CONTENANT CHACUNE UNE PLURALITE DE CELLULES. SELON L'INVENTION, LE PROCEDE EST CARACTERISE EN CE QU'IL CONSISTE A DETECTER POUR CHAQUE ZONE L'AMPLITUDE MAXIMUM DES SIGNAUX DE LECTURE CORRESPONDANT AUX FRONTS DE RATTRAPAGE DE CELLULES DU DEBUT DE LA ZONE ET A LA MEMORISER, A GENERER A PARTIR DE LADITE AMPLITUDE MAXIMUM, DEUX SEUILS DE DETECTION EGAUX ET DE SIGNES OPPOSES, A FAIRE LA COMPARAISON DE L'AMPLITUDE MAXIMUM ET DE L'AMPLITUDE PREDETERMINEE D'UN SIGNAL DE REFERENCE ET A AMPLIFIER LES SIGNAUX DE LECTURE DE LA ZONE, EN FONCTION DU RESULTAT DE CETTE COMPARAISON. APPLICABLE AUX MEMOIRES A DISQUES.PROCESS FOR SERVICING THE READING SIGNAL OF AN INFORMATION MEDIA CARRIED BY A PLURALITY OF TRACKS WHOSE TRACKING INFORMATION IS WRITTEN INSIDE A PLURALITY OF REFERENCE ZONES EACH CONTAINING A PLURALITY OF CELLS. ACCORDING TO THE INVENTION, THE PROCESS IS CHARACTERIZED IN THAT IT CONSISTS OF DETECTING FOR EACH ZONE THE MAXIMUM AMPLITUDE OF THE READING SIGNALS CORRESPONDING TO THE CELL CATCHING FRONTS AT THE BEGINNING OF THE ZONE AND IN STORING IT, GENERATING FROM THE SAID MAXIMUM AMPLITUDE, TWO EQUAL DETECTION THRESHOLDS AND OPPOSITE SIGNS, TO MAKE THE COMPARISON OF THE MAXIMUM AMPLITUDE AND THE PREDETERMINED AMPLITUDE OF A REFERENCE SIGNAL AND TO AMPLIFY THE READING SIGNALS OF THE ZONE, ACCORDING TO THE RESULT OF THIS COMPARISON. APPLICABLE TO DISK MEMORIES.

FR7812118A 1978-04-25 1978-04-25 PROCESS FOR SERVICING THE READING SIGNAL OF AN INFORMATION MEDIA AND DEVICE FOR IMPLEMENTING IT Granted FR2424601A1 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
FR7812118A FR2424601A1 (en) 1978-04-25 1978-04-25 PROCESS FOR SERVICING THE READING SIGNAL OF AN INFORMATION MEDIA AND DEVICE FOR IMPLEMENTING IT
GB7911976A GB2022886B (en) 1978-04-25 1979-04-05 Method of processing the read signal from a data carrier and arrangement for putting the method into practice
JP4918979A JPS54143611A (en) 1978-04-25 1979-04-23 Method of and device for tracting and controlling signal read from a data carrier
IT22080/79A IT1112524B (en) 1978-04-25 1979-04-23 PROCEDURE FOR SERVING THE READING SIGNAL OF AN INFORMATION SUPPORT, AND DEVICE TO IMPLEMENT IT
DE19792916473 DE2916473A1 (en) 1978-04-25 1979-04-24 REGULATING PROCEDURE FOR THE READ-OUT SIGNAL OF AN INFORMATION CARRIER AND DEVICE FOR PERFORMING THE PROCESS

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7812118A FR2424601A1 (en) 1978-04-25 1978-04-25 PROCESS FOR SERVICING THE READING SIGNAL OF AN INFORMATION MEDIA AND DEVICE FOR IMPLEMENTING IT

Publications (2)

Publication Number Publication Date
FR2424601A1 true FR2424601A1 (en) 1979-11-23
FR2424601B1 FR2424601B1 (en) 1980-09-19

Family

ID=9207527

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7812118A Granted FR2424601A1 (en) 1978-04-25 1978-04-25 PROCESS FOR SERVICING THE READING SIGNAL OF AN INFORMATION MEDIA AND DEVICE FOR IMPLEMENTING IT

Country Status (5)

Country Link
JP (1) JPS54143611A (en)
DE (1) DE2916473A1 (en)
FR (1) FR2424601A1 (en)
GB (1) GB2022886B (en)
IT (1) IT1112524B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0219037A2 (en) * 1985-10-08 1987-04-22 Sharp Kabushiki Kaisha Waveform processing circuit
EP0369472A2 (en) * 1988-11-17 1990-05-23 Mitsubishi Denki Kabushiki Kaisha Signal processing circuit

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4495528A (en) * 1981-07-10 1985-01-22 Victor Company Of Japan, Ltd. Magnetic reproducing system for a digital signal
JPS5963005A (en) * 1982-10-04 1984-04-10 Toshiba Corp Magnetic recording system
JPH02166670A (en) * 1988-12-20 1990-06-27 Tokico Ltd Magnetic disk device

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2071751A5 (en) * 1969-11-26 1971-09-17 Ibm
US3660821A (en) * 1970-06-17 1972-05-02 Burroughs Corp Disc file agc circuit
US3691543A (en) * 1971-02-08 1972-09-12 Ibm Positioning system including servo track configuration and associated demodulator
US3840756A (en) * 1973-02-05 1974-10-08 Honeywell Inf Systems Gain control circuit using sample and hold feedback
US3879674A (en) * 1973-12-27 1975-04-22 Burroughs Corp Automatic gain control circuit

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4912645B1 (en) * 1969-04-21 1974-03-26
US3902190A (en) * 1973-11-23 1975-08-26 Rca Corp Programmable test of read/write circuitry by varying clipping levels
DE2601437A1 (en) * 1976-01-16 1977-07-21 Licentia Gmbh AF amplifier AGC circuit - has main and auxiliary RC timing elements connected in parallel
FR2346806A1 (en) * 1976-03-31 1977-10-28 Honeywell Bull Soc Ind MODE OF WRITING ADDRESS ON MAGNETIC RECORDING MEDIUM

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2071751A5 (en) * 1969-11-26 1971-09-17 Ibm
US3660821A (en) * 1970-06-17 1972-05-02 Burroughs Corp Disc file agc circuit
US3691543A (en) * 1971-02-08 1972-09-12 Ibm Positioning system including servo track configuration and associated demodulator
US3840756A (en) * 1973-02-05 1974-10-08 Honeywell Inf Systems Gain control circuit using sample and hold feedback
US3879674A (en) * 1973-12-27 1975-04-22 Burroughs Corp Automatic gain control circuit

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0219037A2 (en) * 1985-10-08 1987-04-22 Sharp Kabushiki Kaisha Waveform processing circuit
EP0219037A3 (en) * 1985-10-08 1989-08-30 Sharp Kabushiki Kaisha Waveform processing circuit
EP0369472A2 (en) * 1988-11-17 1990-05-23 Mitsubishi Denki Kabushiki Kaisha Signal processing circuit
EP0369472A3 (en) * 1988-11-17 1991-09-25 Mitsubishi Denki Kabushiki Kaisha Signal processing circuit

Also Published As

Publication number Publication date
FR2424601B1 (en) 1980-09-19
JPH0135421B2 (en) 1989-07-25
DE2916473A1 (en) 1979-10-31
GB2022886A (en) 1979-12-19
IT7922080A0 (en) 1979-04-23
GB2022886B (en) 1983-02-02
DE2916473C2 (en) 1988-08-11
JPS54143611A (en) 1979-11-09
IT1112524B (en) 1986-01-20

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